Sedov point explosion test for the explosion energy 10⁵¹ erg and background density n = 0.01 cm^-3. The analytic solution is shown by the red lines, while the numerical solutions along the z-axis, r-axis, and diagonal z = r are shown by the black, pink, and blue lines, respectively. The top left panel presents the solution for the tensor artificial viscosity with C₂ = 6 ; the top right panel, for the scalar artificial viscosity and C₂ = 3; the bottom left panel, for the tensor artificial viscosity and C₂ = 3; and the bottom right panel, for the tensor artificial viscosity with off-diagonal terms set to zero and C₂ = 6.